Siraha 1 is one of four parliamentary constituencies of Siraha District in Nepal. This constituency came into existence on the Constituency Delimitation Commission (CDC) report submitted on 31 August 2017.In 2026, Bablu Gupta of Rastriya Swatantra Party won the parliamentary election from this constituency.
Siraha 1 incorporates Bhagwanpur Rural Municipality, Sakhuwanankar Katti Rural Municipality, Lahan Municipality, wards 2âÂÂ6 of Laxmipur Patari Rural Municipality and wards 1 and 2 of Dhangadhimai Municipality.
It encompasses the following Madhesh Provincial Assembly segment